EP1280180A2 - Canon a électrons pour tube à rayons cathodiques - Google Patents

Canon a électrons pour tube à rayons cathodiques Download PDF

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Publication number
EP1280180A2
EP1280180A2 EP02253770A EP02253770A EP1280180A2 EP 1280180 A2 EP1280180 A2 EP 1280180A2 EP 02253770 A EP02253770 A EP 02253770A EP 02253770 A EP02253770 A EP 02253770A EP 1280180 A2 EP1280180 A2 EP 1280180A2
Authority
EP
European Patent Office
Prior art keywords
electrode
hole
electron beam
electron
size
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02253770A
Other languages
German (de)
English (en)
Other versions
EP1280180A3 (fr
Inventor
Dae Sik Daewoo Apt. 105-1502 Hwang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Philips Displays Korea Co Ltd
Original Assignee
LG Philips Displays Korea Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR10-2002-0023428A external-priority patent/KR100459224B1/ko
Application filed by LG Philips Displays Korea Co Ltd filed Critical LG Philips Displays Korea Co Ltd
Publication of EP1280180A2 publication Critical patent/EP1280180A2/fr
Publication of EP1280180A3 publication Critical patent/EP1280180A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations

Definitions

  • the present invention relates to a cathode ray tube, and more particularly, to an electron gun for a cathode ray tube that can reduce a change in the size of a spot due to a change of a focus voltage and a change of current.
  • a cathode ray tube includes an in-line electron gun that emits three electron beams, a deflection yoke that deflects the electron beams in a predetermined place of a screen, a shadow mask that selects the electron beams, and a screen that reproduces a picture image by colliding with the electron beams.
  • a typical electron beam spot enlarges - if beam current increases. Therefore, to obtain a fine picture image, the beam current should be within the smaller range if possible.
  • a cathode ray tube that requires high current has a great change of current
  • a uni-bi potential lens structure having an improved pre-focus area in a bi potential main lens structure has been employed to reduce the spot size on the screen.
  • a related art electron gun for a cathode ray tube will be described with reference to FIG. 1.
  • the related art electron gun includes a cathode K that emits three electron beams of R, G, and B, a first electrode 1 that controls the electron beams emitted from the cathode K, a second electrode 2 that accelerates a thermal electron emitted from the first electrode 1, third, fourth and fifth electrodes 3, 4, and 5 that focus the electron beams, and a sixth electrode 6 that acts as an anode.
  • the electron beams are emitted.
  • the emitted electron beams are controlled by the first electrode 1 that acts as a control electrode. Also, the emitted electron beams are accelerated by the second electrode 2 and focused by the third to sixth electrodes 3, 4, 5, and 6.
  • the current density of crossover does not increase by an increased value of the beam current due to the space charge repulsion.
  • the current density is uniformly distributed without forming Gaussian distribution, thereby degrading the crossover. If the crossover is degraded, the spot on the screen is degraded accordingly.
  • the crossover To prevent the crossover from being degraded, it is necessary to reduce the potential of the crossover, thereby reducing the space charge repulsion.
  • the third electrode 3 moves to the second electrode 2.
  • the potential of the crossover increases while the space charge repulsion decreases.
  • another pre-focus lens may be provided between the pre-focus lens by the second and third electrodes 2 and 3 and the main lens.
  • the pre-focus lens is formed in a uni-potential lens structure by dividing a focus electrode into the third, fourth, and fifth electrodes 3, 4, and 5 and applying the same voltage to the third and fifth electrodes 3 and 5.
  • an electron beam through hole 41 of the fourth electrode 4 has the same size as that of an electron beam through hole 51 of the fifth electrode 5.
  • the electron beam through hole 51 of the fifth electrode 5 is formed in a direction of the fourth electrode.
  • the electron beam through hole 41 of the fourth electrode is greater than an electron beam through hole 31 of the third electrode 3.
  • the emitting angle of the electron beams entered into the main lens decreases. This decreases the size Db of the electron beam in the main lens. If the size Db of the electron beam in the main lens decreases, the spherical aberration decreases. As a result, the size of the spot on the screen decreases.
  • the fourth electrode is formed in a plate shape in the pre-focus lens at the front of the main lens so that the emitting angle of the electron beams is adjusted. At this time, the fourth electrode is adjacent to the third electrode while the fifth electrode is adjacent to the fourth electrode. In forming the pre-focus lens, the electron beam through hole of the fourth electrode has the same size as that of the fifth electrode.
  • design factors that can adjust the emitting angle are limited to each thickness of the third, fourth, and fifth electrodes, the distance d1 between the third electrode and the fourth electrode, the distance d2 between the fourth electrode and the fifth electrode, the size of the electron beam through hole of the third electrode, the size of the electron beam through hole of the fourth electrode, and the size of the electron beam through hole of the fifth electrode.
  • supplementary electrodes are required among the second electrode, the third electrode, and the fourth electrode. This causes a complicated structure.
  • the present invention is directed to an electron gun for a cathode ray tube that addresses one or more problems due to limitations and disadvantages of the related art.
  • an electron gun for a cathode ray tube including a cathode that emits electron beams, a first electrode that controls the electron beams emitted from the cathode, a second electrode that accelerates the electron beams emitted from the first electrode, and third to fifth electrodes sequentially arranged in a screen direction to act as pre-focus lenses
  • the electron gun is characterized in that the third to fifth electrodes have different sized electron beam through holes.
  • each electron beam through hole of the third and fourth electrodes is smaller than the electron beam through hole of the fifth electrode.
  • the electron beam through hole of the third electrode is smaller than that of the fourth electrode.
  • the electron beam through hole of the fourth electrode has a rectangular shape and its vertical length is different from its horizontal length.
  • the third electrode has a first through hole opposite to the second electrode and a second through hole opposite to the fourth electrode.
  • the size of the first through hole is different from that of the second through hole. More preferably, the size of the first through hole is smaller than that of the second through hole.
  • an electron gun for a cathode ray tube includes a cathode K that emits electron beams, a first electrode 11 that controls the electron beams emitted from the cathode K, a second electrode 12 that accelerates the electron beams, a pre-focus lens of third, fourth and fifth electrodes 13, 14 and 15 that control an emitting angle of the electron beams, and fifth and sixth electrodes 15 and 16 that constitute a main lens part.
  • the third electrode 13 is arranged to oppose and be adjacent to the fourth electrode 14.
  • the fourth electrode 14 is arranged to oppose and be adjacent to the fifth electrode 15.
  • the third electrode 13, the fourth electrode 14, and the fifth electrode 15 respectively have different electron beam through holes.
  • the electron beam through hole 411 of the fourth electrode 14 may be greater than the electron beam through hole 311 of the third electrode 13.
  • the electron beam through hole 511 of the fifth electrode 15 may be greater than the electron beam through hole 411 of the fourth electrode 14.
  • the electron beam through hole 311 of the third electrode 13 and the electron beam through hole 411 of the fourth electrode 14 may be smaller than the electron beam through hole 511 of the fifth electrode 15.
  • an emitting angle of the electron beam and the size of the electron beam in the main lens part may easily be varied.
  • a lens L1 denotes an emitting lens by the third and fourth electrodes
  • a lens L2 denotes a focus lens by the third, fourth, and fifth electrodes
  • a lens L3 denotes an emitting lens by the fourth and fifth electrodes.
  • the electron beam through hole 411 of the fourth electrode 14 is greater than the electron beam through hole 311 of the third electrode 13.
  • the electron beam through hole 511 of the fifth electrode 15 is greater than the electron beam through hole 411 of the fourth electrode 14.
  • the emitting angle of the electron beam to the main lens and the size Db of the electron beam in the main lens can decrease. Decrease of the emitting angle of the electron beam and the size Db of the electron beam reduces spherical aberration, thereby reducing the size of a spot on a screen.
  • the size of the electron beam through hole 411 of the fourth electrode 14 is adjusted appropriately. That is, if the electron beam through hole 411 of the fourth electrode 14 becomes great, the intensity of the lens L2 is weaker than the intensity of the lenses L1 and L3. Thus, the emitting angle of the electron beam and the size Db of the electron beam in the main lens become great. On the other hand, if the electron beam through hole 411 of the fourth electrode 14 becomes small, the intensity of the lens L2 becomes more robust than the intensity of the lenses L1 and L3. Thus, the emitting angle of the electron beam and the size Db of the electron beam in the main lens become small.
  • the electron beam through holes 311, 411, and 511 are not limited to shapes suggested in the present invention. That is, the electron beam through holes may have a circular shape, a rectangular shape, or the like. As shown in FIG. 6, if the electron beam through hole 411 of the fourth electrode has a rectangular shape, it is preferable that its vertical length 411h is different from its horizontal length 411w. This is because that the emitting angle of the electron beam in vertical and horizontal directions and the size Db of the electron beam in the main lens can be adjusted.
  • the third and fourth electrodes 13 and 14 have plate shapes, they are not limited to the plate shapes. That is, the third electrode 13 and/or the fourth electrode 14 may have a cylindrical shape.
  • the third electrode 13 may have a first through hole 311a opposite to the second electrode 12 and a second through hole 311b opposite to the fourth electrode 14. In this case, it is preferable that the size of the first through hole 311a is different from the size of the second through hole 311b. More preferably, the size of the first through hole 311a is smaller than the size of the second through hole 311b.
  • the fourth electrode 14 may also have a first through hole 411a opposite to the third electrode 13 and a second through hole 411b opposite to the fifth electrode 15.
  • the size of the electron beam through hole 511 of the fifth electrode ⁇ 0.1 ⁇ the size of the electron beam through hole 311 of the third electrode 13 ⁇ the size of the electron beam through hole 511 of the fifth electrode ⁇ 0.5 ⁇ .
  • the emitting angle decreases considerably to depart from an optimal emitting angle, thereby increasing the size of the spot on the screen if the size of the electron beam through hole 411 of the fourth electrode is smaller than ⁇ the size of the electron beam through hole 511 of the fifth electrode ⁇ 0.5 ⁇ while assembly of the electron gun is not easy if the size of the electron beam through hole 411 of the fourth electrode is greater than ⁇ the size of the electron beam through hole 511 of the fifth electrode ⁇ .
  • the electron gun for a cathode ray tube according to the present invention has the following advantages.
  • the emitting angle of the electron beam to the main lens and the size of the electron beam in the main lens can be reduced by adjusting the respective size of the electron beam through holes of the third to fifth electrodes. This can reduce the spherical aberration and can prevent the spot on the screen from being degraded.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cold Cathode And The Manufacture (AREA)
EP02253770A 2001-07-25 2002-05-29 Canon a électrons pour tube à rayons cathodiques Withdrawn EP1280180A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR2001044873 2001-07-25
KR20010044873 2001-07-25
KR10-2002-0023428A KR100459224B1 (ko) 2001-07-25 2002-04-29 음극선관용 전자총
KR2002023428 2002-04-29

Publications (2)

Publication Number Publication Date
EP1280180A2 true EP1280180A2 (fr) 2003-01-29
EP1280180A3 EP1280180A3 (fr) 2005-02-09

Family

ID=26639260

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02253770A Withdrawn EP1280180A3 (fr) 2001-07-25 2002-05-29 Canon a électrons pour tube à rayons cathodiques
EP02291866A Withdrawn EP1280181A3 (fr) 2001-07-25 2002-07-24 Canon à électrons pour tube à rayons cathodiques

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP02291866A Withdrawn EP1280181A3 (fr) 2001-07-25 2002-07-24 Canon à électrons pour tube à rayons cathodiques

Country Status (4)

Country Link
US (2) US7045943B2 (fr)
EP (2) EP1280180A3 (fr)
JP (2) JP2003051266A (fr)
CN (1) CN1207751C (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60331849D1 (de) * 2002-11-05 2010-05-06 Glaxosmithkline Llc Antibakterielle wirkstoffe
US20060210729A1 (en) 2005-03-18 2006-09-21 Konica Minolta Photo Imaging, Inc. Ink-jet recording sheet
US8957394B2 (en) * 2011-11-29 2015-02-17 Kla-Tencor Corporation Compact high-voltage electron gun

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169239A (en) * 1974-07-26 1979-09-25 Hitachi, Ltd. Electrostatically focusing type image pickup tubes and method of manufacturing the same
GB2115605A (en) * 1982-02-26 1983-09-07 Sony Corp Electron guns
US4540916A (en) * 1981-10-30 1985-09-10 Nippon Hoso Kyokai Electron gun for television camera tube
US5015911A (en) * 1988-11-17 1991-05-14 Samsung Electron Devices Ltd. Multistep focusing electron gun for cathode ray tube

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369239A (en) * 1981-08-03 1983-01-18 E. I. Du Pont De Nemours And Company Process for preparation of photopolymerized dot-etchable masks using staging solution
US4426583A (en) * 1982-05-10 1984-01-17 International Business Machines Corporation Electron beam potential switching apparatus
JPS6199249A (ja) * 1984-10-18 1986-05-17 Matsushita Electronics Corp 受像管装置
KR900001707B1 (ko) * 1987-05-26 1990-03-19 삼성전관 주식회사 컬러 음극선관용 전자총
US5039906A (en) * 1990-05-08 1991-08-13 Samsung Electron Devices Co., Ltd. Electron gun for color cathode ray tube
KR930007583Y1 (ko) * 1990-12-29 1993-11-05 삼성전관 주식회사 음극선관용 전자총
KR940010986B1 (ko) * 1992-05-19 1994-11-21 삼성전관 주식회사 칼라 음극선관용 전자총
JPH0714521A (ja) 1993-06-22 1995-01-17 Toshiba Corp 陰極線管用電子銃
KR960016260B1 (ko) * 1993-09-04 1996-12-07 엘지전자 주식회사 인라인형 칼라 음극선관용 전자총의 전압 인가 방법 및 전극 구조
KR970009209B1 (en) 1994-01-22 1997-06-07 Lg Electronics Inc In-line type electron gun for crt
JPH07249384A (ja) * 1994-03-09 1995-09-26 Hitachi Ltd カラー陰極線管
JPH08190877A (ja) * 1995-01-09 1996-07-23 Hitachi Ltd 陰極線管
KR100223823B1 (ko) 1996-10-21 1999-10-15 구자홍 컬러 음극선관용 전자총의 집속전극 구조
KR100274245B1 (ko) * 1997-12-10 2000-12-15 김순택 음극선관용전자총
JP2001155657A (ja) 1999-11-30 2001-06-08 Nec Kansai Ltd カラー陰極線管用電子銃およびその電子銃を装着したカラー陰極線管
US6570349B2 (en) * 2001-01-09 2003-05-27 Kabushiki Kaisha Toshiba Cathode-ray tube apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169239A (en) * 1974-07-26 1979-09-25 Hitachi, Ltd. Electrostatically focusing type image pickup tubes and method of manufacturing the same
US4540916A (en) * 1981-10-30 1985-09-10 Nippon Hoso Kyokai Electron gun for television camera tube
GB2115605A (en) * 1982-02-26 1983-09-07 Sony Corp Electron guns
US5015911A (en) * 1988-11-17 1991-05-14 Samsung Electron Devices Ltd. Multistep focusing electron gun for cathode ray tube

Also Published As

Publication number Publication date
EP1280180A3 (fr) 2005-02-09
JP2003051266A (ja) 2003-02-21
JP2003051267A (ja) 2003-02-21
EP1280181A3 (fr) 2005-02-09
CN1399300A (zh) 2003-02-26
EP1280181A2 (fr) 2003-01-29
US20030020389A1 (en) 2003-01-30
US7045943B2 (en) 2006-05-16
US20030020391A1 (en) 2003-01-30
CN1207751C (zh) 2005-06-22

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